Stored compressed air management for improved engine performance

摘要

Methods and systems are provided for raising an exhaust temperature to spin a turbocharger turbine and reduce turbo-lag. Pressurized air is discharged from a boost reservoir into an intake manifold while spark retard is increased to expedite exhaust heating while also increasing a net combustion torque. By expediting turbine spin-up in response to a tip-in, turbo-lag is reduced and engine performance is improved.

主权项

1. A method of operating a boosted engine, comprising:
during a first tip-in, discharging pressurized air from a boost reservoir to an intake manifold downstream of a compressor with a first, smaller amount of spark retard; and during a second tip-in, discharging pressurized air from the boost reservoir to the intake manifold with a second, larger amount of spark retard.